This is v4 of the patches posted at:
https://www.mail-archive.com/linuxppc-dev@lists.ozlabs.org/msg130739.html
This series has been tested using mambo for p8 (hash) and p9 (radix).
v4 changes:
- flip the paca field from 'ftrace_disabled' to 'ftrace_enabled' to
signify a default disable policy to address early boot
- add and use helpers to disable/enable ftrace, which addresses 32-bit
build issues
- a new patch to address issues with function_graph tracing during cpu
hotplug.
The last three patches are unchanged from the previous series, for the
most part (except for the ftrace_disabled -> ftrace_enabled adjustment).
The last two patches implement support for ftrace_caller() to
conditionally save the register state. This speeds up the function
tracer a bit. The existing ftrace_caller() is renamed to
ftrace_regs_caller() since we save the entire pt_regs today. A new
implementation of ftrace_caller() that saves the minimum register state
is provided. We switch between the two variants through
ftrace_modify_call(). The necessary support to call into the two
different variants from modules is also added.
- Naveen
Naveen N. Rao (10):
powerpc64/ftrace: Add a field in paca to disable ftrace in unsafe code
paths
powerpc64/ftrace: Disable ftrace during kvm guest entry/exit
powerpc64/ftrace: Rearrange #ifdef sections in ftrace.h
powerpc64/ftrace: Add helpers to hard disable ftrace
powerpc64/ftrace: Delay enabling ftrace on secondary cpus
powerpc64/ftrace: Disable ftrace during hotplug
powerpc64/kexec: Hard disable ftrace before switching to the new
kernel
powerpc64/module: Tighten detection of mcount call sites with
-mprofile-kernel
powerpc64/ftrace: Use the generic version of ftrace_replace_code()
powerpc64/ftrace: Implement support for ftrace_regs_caller()
arch/powerpc/include/asm/ftrace.h | 27 +++-
arch/powerpc/include/asm/module.h | 3 +
arch/powerpc/include/asm/paca.h | 1 +
arch/powerpc/kernel/asm-offsets.c | 1 +
arch/powerpc/kernel/machine_kexec.c | 2 +
arch/powerpc/kernel/module_64.c | 43 +++--
arch/powerpc/kernel/setup_64.c | 7 +
arch/powerpc/kernel/smp.c | 12 ++
arch/powerpc/kernel/trace/ftrace.c | 210 ++++++++++++++++++++-----
arch/powerpc/kernel/trace/ftrace_64_mprofile.S | 85 +++++++++-
arch/powerpc/kernel/trace/ftrace_64_pg.S | 4 +
arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +
12 files changed, 336 insertions(+), 67 deletions(-)
--
2.16.2
